Abstract
The biological and chemical importance of metalloporphyrins has stimulated extensive studies on the physicochemical properties of the macrocycle during recent years. Because of their strong absorption in the visible and near-UV region and the availability of tunable lasers, resonance Raman scattering from metalloporphyrins has emerged as a very sensitive and selective technique for probing structural details and nature of bonding at physiologically relevant concentrations. The variations of intensities and depolarization ratios as functions of excitation wavelength, band position and band shapes under different conditions have provided detailed information about the excited electronic states, structure, spin, oxidation and coordination states of the central metal and electron transfer processes in these systems. We shall illustrate the potential of this technique based on some selected examples including photo-reduction and photo-oxidation processes in metalloporphyrins.
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